I think that the sort of Irish name has been established - something like the two names above ending with ----laduff. I was actually reading the first few letters as Saul which would be an Antrim name but couldn't make it work, so I reckon, just keep mind - and eyes open. Names like these which simply describe a place are duplicated throughout Ireland anyway - duff, duv, dubh meaning black or dark as in Dublin - black water.